What the differences between 'solo' and 'unico'?

Question

Answer

Solo (without an accent): Lonely, alone, without some one else. 
'Estoy solo en casa' (I'm home alone).

Sólo (with accent): Only, just.  
'Sólo quiero estar en casa' (I just wanna be home).

Único: unique, also can be translated as only in some cases. 
'Una pieza única' (A unique piece). 
'Es mi único amigo'  (He's my only friend)

Best regards,
Alejo.

REF.: I'm a Spanish Teacher.